The vld are hard to get to shoot well. You'll have to play with the seating depth to get them. Imr4350 is just fine. I use it with 42 grain and 140 class bullets in a 243 win winchester case sized to 260. Most 260 like from 42 to 43.5 grains. Depending on your barrel length you should be from 2700 to 2850 ftps with those loads.
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